Envelope Tracking Delay Tuning for Power Amplifier Heat Loss
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Solution Overview
Problem
Current communication devices face inefficiencies in power amplifier performance due to mismatched phase between input signals and envelope signals, leading to heat loss and reduced RF performance, which is exacerbated by the need for high sampling rates that increase power consumption and hardware costs.
Innovation Solution
A method and device that optimize envelope delay by estimating adjacent channel leakage ratios for various test delay values, selecting the optimal delay value, and synchronizing the envelope signal with the power amplifier supply voltage, thereby enhancing power amplifier efficiency and reducing heat loss.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If envelope tracking modulation is used to improve power amplifier efficiency, then power efficiency is improved, but phase mismatch between input signal and envelope causes heat loss and reduced RF performance
Solution Approach 1:
The patent applies preliminary action by measuring and determining the optimal envelope delay value before normal operation. The system performs envelope delay measurement using test signals and adjacent channel leakage ratio measurements to establish the correct delay compensation value in advance, ensuring that the envelope signal is properly synchronized with the RF signal phase from the beginning of operation, thereby preventing heat loss while maintaining power amplifier efficiency.
2Measurement precision
If high sampling rates are used to improve measurement precision, then adjacent channel leakage ratio measurement accuracy is improved, but power consumption and hardware costs increase
Solution Approach 1:
The patent applies parameter changes by optimizing the sampling rate to be just sufficient for accurate adjacent channel leakage ratio measurement without excessive overhead. The system determines an appropriate sampling rate that balances measurement precision requirements with power consumption constraints, avoiding the need for continuously high sampling rates while maintaining adequate measurement accuracy for envelope delay optimization.
3Device complexity
If envelope delay is not optimized, then device complexity is reduced, but power amplifier efficiency deteriorates and heat loss increases
Solution Approach 1:
The patent applies feedback by using adjacent channel leakage ratio measurements to determine the optimal envelope delay value. The system measures the adjacent channel leakage ratio at different delay values, identifies the delay value that minimizes leakage (indicating optimal phase alignment), and applies this delay setting to optimize power amplifier efficiency. This feedback-based approach provides an automated method to balance complexity and performance.
Data Source
AI summary
A method is provided. The method includes estimating adjacent channel leakage ratios respectively corresponding based on a test output signal output from a power amplifier according to a test input signal corresponding to a plurality of frequencies; selecting a test delay value corresponding to a largest value among the estimated adjacent channel leakage ratios; and providing a supply voltage to the power amplifier based on an envelope signal delayed according to the selected test delay value. For each of the plurality of test delay values, a corresponding adjacent channel leakage ratio is estimated based on a ratio of a magnitude of a component included in the test output signal and a magnitude of an inter-modulated component.